It's well known that tanks in 4.x is a little bit off. Raising the prices of most of the tanks slightly would be an easy fix, but I think that’s just not the right thing to do in all cases. So here is my suggestions.
Going to start with the early tanks. The hovercrafts weaponry are all pretty good, their speed is good their price is good, but steering them I find to be a real pain in the arse. I'm sure this will get fixed. The biggest problem with them is how they don't want to hover over water and just sit under the water moving very slowly. Really sucks, hopefully that will get fixed soon Tm.
And now the Partisan, the real game breaker at the moment in early game. This tank rapes everything early game and even mid game, EXCEPT it doesn’t rape the things it's meant to, stuff that flies. Now the problem is twofold, the fact an 80ton tank is available at the beginning, and the fact it has to be available because otherwise VTOL would be the hand of God.
After trying to use it to kill VTOLs I found it was pretty hard to use to kill stuff, AC5 just fires so slowly, downgrading to AC2, adding another 2 (or add whatever is possible tonnage wise) instead of the AC5, increases it range, (stops VTOL staying out of range) and the faster firing rate makes them far easier to use.
The only reason this isn't done is because then it would rape even harder on the ground, and here is the problem most people don't relies. Partisan is 80ton tank, it should NOT be available at start game, in fact a medium tank around 50tons or so should be available. A tank with 2xAtm9 with reasonable armour and speed would be enough to take down VTOL easily for the clan, while the IS with X Pulse lasers on a medium tank would work fine without the ground rape. Maybe this is already in the works I hope so.
Now with a medium AA tank taking the partisan role at start of game, the partain can get its AC2 back, and be priced fitting an 80ton tank. The huit needs to be priced a bit more than the partisan (because it's clan) with similar load out but clan weapons.
Oro always feels like it needs some love. Maybe it's just the lack of armour compared to the other tanks or the mix weaponry that makes it feel weaker. But the fact is the oro is probably one of the best balanced tanks at the moment.
Which leads onto the demo and Morrigu. They both rape hard. They should, but when you can walk into 4 medium mechs and just sit there shrugging off the damage and then walk away before you die, you truly realise how much armour these things have. There is only one reason not to take either of these tanks and that’s speed and manoeuvrability. Otherwise you would be crazy to take a mech with 1/3 less armour and survivability when it comes to defending a base.
But instead of using the nerf stick on the tanks (Maybe their armour and more importantly heat sinks need to be looked at) there is a far easier way to nerf these tanks without even touching the tanks. Do not let the mech bays build 80+ ton tanks when they CANNOT make 80ton+ mechs. It beggars belief why the biggest mech they can make is a medium, but it's perfectly fine in making assault like tanks! It's no wonder everyone is rolling around in tanks with a choice of a medium mech or a tank with twice the armour and fire power! With the need to actually have to use a proper mechbay like mechs to make the bigger heavier units, you suddenly give the tanks a disadvantage that hasn't effected them in 4.x. the speed and manoeuvrability to get to bases to defend.
I'm perfectly happy with them being the best defence units as long as they had to spend time to get there, just like any other heavy and assault in the game. Once again the lack of medium tanks might be why this hasn't been changed, and shows how important they are needed.
So in summary:
Hovercraft need their handling and bugs fixed
Game needs medium tanks badly for IS and clan
Clan need ATM9 medium tank
IS need X-pulse medium tank
Partisan needs to be given AC2 and price increase to fit it's 80ton spec
Huit needs to be comparable to the partisan in AA with clan weapons and slight higher price
Oro needs to be left alone
Demo may need armour be adjusted tiny bit
Morrigu needs it's heat sinks looked into, Heavy large laser rape isn't fun.
Do not let heavy and assault tanks spawn at smaller mech bays with medium mech limits.
I know these things take time, but if they was to eventually happen would make the game far more enjoyable than the tank > everything but fire bombs, which TC is now.
*Edit* Fixed all my fail spelling of the word Partisan.